Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02c6b6c31a4e6a7…

MALICIOUS

PDF

138.5 KB Created: 2021-06-26 06:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a03f37ef04da9091cf334516b07d68a7 SHA-1: 7f7f4a815d5898fdece30b8771df0388047af24b SHA-256: c02c6b6c31a4e6a7903d29cb0fb158fd5d22d2cc3b11e2d5192a8702e93239e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cafehinglung.com/uploads/files/6845479170.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb46e2f60---duxugazabigipunuxanesuje.pdf
    • https://tolgyesvolgy.hu/userfiles/file/55852116623.pdf
    • http://atonoserver.com/userfiles/file/6122246191.pdf
    • https://whitesal.com/data/images/file/5455_20210526103217.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e397d2e715---mufefikozasalelafu.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa25b2eb57---davijuforetiguje.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160890fa9db124---16183502856.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f360206f617e21f6f94a5b636f7603a2/najideru.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff61422091---nokok.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/segaweduweparujoji.pdf
    • http://fygl.net/uploads/file/250830018447.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5d377180---64542968697.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qkqmo7b1586ghk4rshda3a07o5/17200036862.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/duvobiwamokivigagub.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c394a0c42e2---tukopedelop.pdf
    • http://fautographie.org/images/userfiles/files/ledab.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/186218a20337b57f5946245888ec9a0b/rirumiwet.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8a786f8dba7a328e8515aa4743fa0cb9/50420803517.pdf
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/72600072009.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b72f478c490513b665539ab4d2ccd293/pupasugamax.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bl7s6682l68kqpgjfh9b3dgqs3/70304688829.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffeecc442---bogagafezixalerozizulojof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=inverse+polymerase+chain+reaction
    • https://doi.org/10.1111
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001cab4.bin
4c6469db941b3a54eef26103500d23e525bf03e015d98afc90ee0e9dd35f90cf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CAB4 18176 bytes
font_00_sfnt_off000199fe.bin
63d972d301c01f7912ffbce0b368de2dc5f259310cc4a65390ae84f049aa3137
pdf-font-stream PDF embedded font (sfnt) at offset 0x199FE 10772 bytes
font_01_sfnt_off0001b2a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2A3 16792 bytes
font_03_sfnt_off0001e708.bin
199d4db9ebaf9365ad28b20d6d87c9296494d072848e7be1d670230165a2ea0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E708 20580 bytes